强非均质碳酸盐岩气藏开发早期气井产能评价方法

高磨灯影组气藏目前处于开发早期阶段,储层缝洞体分布复杂,非均质性强.由于测试井井底积液,同时大部分气井远井区储层物性较差,导致常规回压试井在较大产量制度下,流动状态未能达到稳定,产能测试结果与实际情况相差大.基于气井二项式产能方程,结合非达西系数的迭代运算方法,推导出适用于该目标区块的产能模型.该模型简单实用,适用条件范围明确,同时可以减少现场施工下压力计时间,降低安全风险,对气藏的合理开发,具有重要的指导意义.

Evaluation Method of Gas Well Productivity in Early Development Stage of Strongly Heterogeneous Carbonate Gas Reservoir

At present, the gas reservoir of Dengying Formation in Gaomo is in the early stage of development. The distribution of fracture cavity body is complex and the heterogeneity is strong. Due to the liquid accumulation at the bottom of the test well and the poor physical properties of the reservoir in the far well area of most gas wells, the flow state of conventional back pressure test well can not reach stability under the larger production system, and the productivity test results are greatly different from the actual situation. Based on binomial deliverability equation of gas well and iterative operation method of non Darcy coefficient, the deliverability model suitable for the target block is derived. The model is simple and practical, with clear application conditions. At the same time, it can reduce the time of pressure gauge under construction, reduce the practice risk, and has important guiding significance for the rational development of gas reservoir.